Carriage



Y March i8, QZLQ c. c. SPREEN CARRIAGE Filed July 26. 2 Sweets-Sheet 2 [W 'mw' @HAMM (1.5mm

ihm afmm y@ ATTORNEBM exact description, re

Patented Mar. 1924.

UNITED s'mrss ,PAIETA- OFFICE.

CHARLES c. SPREEN, or miraor'r, MICHIGAN, 'Ass'IfGNoa zLvma'ron. consom- TION, OF DETROIT, MICHIGAN,v

consonancia-br DELAWARE elppueammA nica my ae,A aa., seri'i no. 655,970..

To all 'whome't concern: B e it known -that I, CHARLES C. SPREEN,.li a citizen of the United States, lresidingat- Detroitin the county of lVaynefand State of llllchigan, have invented a certair new and useful Improvement in Carriages, fof

which the following is a full, clear, and

erence being had tothe accompanying drawin s.

frigerating system by means of electric motors it has been found desirable to {nain-'f tain tight the belt con11ecting'-tl1e electric, 'j motor and the compressor by mountin'gthe., a y electric-motor upon a base movablejin the direction of the belt and -by providing means acting te-move the motor freni the coml pressor. Installations of. this character,

however, are ordinarily operated by=person s" 4 unskilled in the operation or maintenance of qu machinery and accordingly are very often operated Without any repairs until deterioration absolutely stops 4further operation." lAccordingly, the operatorl ofA 'one of these sets seldom takes any -steps toA either replace or shorten the belt but on the contrary permits the belt to continue to increase .in le gth `and relies upon the continued With- 'd awal of the motor to maintain tension upthe belt. The various means heretofore used for maintaining this ,tension have ordinarily comprised some sort of acoil spring acting directly upon the motor base and 'accordingly have comprised a device which decreases in etl'ect rapidly as the extent of movement of the' motor base increases and at the extremity of travel ofthe 'motor base exerts but a small fraction of the force originally exerted and therefore ma1n,

tains upon the belt but a small fraction of the desired tension. My invention provides improved means for eiecting this movement of the base and maintaining a substantially constant tension upon the belt.

Inthe drawings accompanying thiss eci-l ,fication and forming a part thereofI ave shown, for purposes of illustration, certain physical embodiments whichz'my invention may assume. In these drawings:

Figure 1 is a side elevation of one embodiment of my invention,

vligure 2 is an end view-of the device shown in Figure -1 looking from the right, Figure 3 is a plan View, of lthe device .55 shown in Figures l and 2,/ with the motor n i In the operation. o 4compressors for ree abbr; jeta aired 14 formedrectanguu 1'5`4'in which it is reciproawhichare in turn car- 'se 16 ,j`whereby .the motor` a'nnei` to permit moverectly'in-Sthc line of the belt iththe 'driven apparatus Vand thergmovement.

. fby'a'free end o a. lever 19 otedxatv 20- to a bracket 21 carriedflbylt 'nitrbaselflf and is provided adn "in.Figures 1, 2, and 43' "basejll arranged to carryi' -121-and secured by means., 65

sgctionltoprevent turning therejacentiitspivbtwitha'lug 22 adapted to be 80 l. driven appaatl'lsilt will 'also be apparent 95 `that?,thea4 ositioni'ng andv roportiomng of the partsgs'lsuchijthat the ull movement'of the rod'l .:14= fa d"'motor base 11 results in a shortenin' jthe ',spi"in '23 which is too slightfftojillflffppeiab y the tension imf posed.by- 'the '"spfing 23 u on thebelt and A that the device;v eremV disc osed. therefore is effective' to maintain [throughout the entire fmovementoffzthebase 11 substantially con-r stant belt'jtension. It will also be apparent that theimeans of securing the end of the s rin 23 to the unit base i16 provides a simp e a 'ustment for the spring 23.

Undjercertain circumstances it may be more convenient to mount the belt tensionof the tension of vthe spring 28.` Lateral ing spring u on 'the other side 4of-the lever 19 and in suc cases I 'may employ the modiiication shown in Figure 4 or the modification shown in Figure 5. The device shown in Figure 4 substitutes for the.ftensitiii ilspring 23 a spring 28 compressedfjbetween t e. lever 19 at oneend and at the o 'th'er end a screw 29 carried by a bracket 30 secured zo which `projects beyond the pivot 20.1

' inadvisable to conneet the 1ever'19 to theA to the unit base 16 and adjustable in the bracket -to permit convenientl variation Under certain` circumstances it -inay be rodfl'bymeansof the sector 18and rack 17- and-"in such cases 'I may Vutilize-the' ar' 25 rangement shown in AFigure 6` wherein-.the

lever 19 is shown as" provided with aislot.

34'arranged to embrace a pin 35 carried by the rod 14 vand to transmit motion, from the lever'19 to the rod 1li-by meansof this pin 30 l.and slot connection.

` It will be apparent to thoseskilled inthe art that I have providedineansfor maintaining substantially constant tension upon Y the belt connecting the motorv 12- with the driven apparatus over a wide range of move'- ment ofthe moto'r'base 11 and that I have therefore'= avoided the defects inherent in the devices heretofore in use. 'It will also be apparent'that my invention may be applied other thanto the motor base'fhe'rein shown and may be modified in various"`-ways additional to the modifications hereiiidisclosed and that these other uses .andfother modifications will still retain--theiiadva'n-v tages of my invention and lie within the spirit thereof. It' will therefore be understood that the disclosure hereinis illus- -t-ra'tive only and that my invention iswnot limi-ted thereto.

I claim:

1. In combination, a bar mounted to permit reci recation in a direction parallel to its axis an tGprevent motion of any Vother kind a base carried thereby and adapted 'to support an electric motor, a lever pivoted to swing in a plane parallel to the plane of ver'19 and the screw 29 and-entering he e e-` said-base and having a freeend operatively? connected to said bar whereb pivotal movement of said lever will resu' t, in .reciproca-- tionof said bar-'ands'aid base, and means acting onsaid lever" adjacent its pivot to cause such pivotal-movement of 'said lever and thus cause such reciprocal movement osaid bar and said base.

" 2. In combination, a bar mounted to. rmit reciprocation in a direction paralle to -i'ts axis and to prevent motion of'any other kind, a base carried thereby and adapted to support. an electric motor, azlever havingA a free end operatively connected to said bar whereby pivotal movement of said lever will result in reciprocation ot-said bar and adjacentits pivot to cause such pivotal movement ofsaid lever and thus cause such base.. A

3. In combix iation, a bar mounted to per. mit reciprocation in a direction parallel to its axis and to prevent motion of any other.

kind, a base carried thereby and adapted to support an electric motor, alever pivoted vsaid base, andl means acting on said lever i l Ireciprocal movement of said bar and said cation of said bar and said base, and means acting on said lever to cause such pivotalmovement of said lever and tvfiuscause such reciprocal movementof said bai' and said base.

4'. In combination, a reciprocable member, a base carried thereby and adapted to support anelectric motor, a lever havin' a free end operatively connected to said' member, and means acting upon said lever adjacent its pivot to swing it in one direction about its pivot to thereby reciprocate said member and said base.

5. In combination. a reciprocable member, a base carried thereby and adapted to supportan electric motor, a lever pivoted to swing' in a plane parallel to the plane zof said base and having a free end operar tively connected to said member, and means acting uponV said lever adjacent its pivot .to swing it in one direction about its pivot to thereby reciprocate said member and said base. A

In testimony whereof, I hereuntoavixmy signature.

" CHARLES C. SPREEN.

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